Nobody was trying to be rude, we were trying to help. He looks like a blue Andalusian. But I have heard of hens that have done the rooster dance, mounted other hens, crow and develop spurs. The best thing you could do is see if he’s fertile. Sorry if anybody offended you, we weren’t trying to.Guys... please just believe me that this is a roo. I am an experienced chicken keeper here (I've had chickens my whole life - trust me, I know a rooster when I see one, especially one that is fully mature) and he exhibits all rooster behaviors, from fighting with my other roo to crowing all morning and dancing around (and mounting) my hens. I dont know what else I can do to convince you all except upload a video, and frankly, that's just too much effort.
Honestly, I'm a little offended at the replies to this thread. In my original post, I said it was DEFINITELY a roo - I've been asking for breed advice, not gender.
At this point, I'm going to assume he's a mixed breed. If anyone else has any ideas of a breed standard he might conform to though, I'm all ears.
The only breed standards that allow for hen feathering in roosters are Campine and Sebright, but according to Wikipedia it appears with less frequency in some other breeds, especially game breeds. Neither Campine nor Sebright have a recognized "blue" variety. If he didn't have hen feathering, he would conform closest to the Blue Andalusian bantam breed standard.
Edit: thank you Jed for writing a respectful, thought-out post with all possibilities, instead of only assuming that I'm incorrect. It's definitely possible that he could be infertile - I just brought him home and haven't had time to test that yet. In fact, the inventor of the Sebright breed, which is characterized by hen feathered roosters, linked infertility to some of them because of the feminine hormones at work to produce hen feathering. It's very possible, and could have been part of why someone gave him away in the first place.